RNMain.exe

Sometimes "RNMain.exe" error happen when your computer's system becomes overloaded or important files become missing, deleted or broken. These types of problems occur from not properly maintaining your computer regularly, leading to critical errors and system malfunctions. This error can be fixed with special software that repairs the registry and tunes up system settings to restore stability.
Extract RNMain.exe from RNMain.exe. We recommend that you extract RNMain.exe to the installation directory of the program that is requesting RNMain.exe.

If that doesn't work, you will have to extract RNMain.exe to your system directory. By default, this is:

C:\Windows\System32\ (Windows XP, Vista, 7,8)

If you use a 64-bit version of Windows, you should also place RNMain.exe in C:\Windows\SysWOW64\

Make sure overwrite any existing files (but make a backup copy of the original file).